Caliber: 5.56 NATO - Weight: 12 oz - Length: 6.0 in - Mount: Direct Thread - Sound Reduction: 32 dB - Diameter: 1.5 in - Materials: Titanium / Inconel - Finish: High-Temp. Cerakote - The heavy-duty Operator TAC-DT for 5.56mm NATO is rated for full-auto ?re and is mounted with a Direct Thread mount with standard � - 28 � 2b threads. - Packing includes the following: (1) 5.56mm suppressor - For barrels: 10.5� minimum length 5.56x45/223.